In Brief
The decision to promote an internal salesperson to Director of Sales or recruit an external candidate has no universal answer. It does, however, have a decision framework.
- Internal promotion preserves field knowledge, accelerates integration, and sends a strong signal to the team. But it confronts the company with the Peter Principle: an excellent salesperson rarely makes an excellent sales director.
- External recruitment brings perspective, proven methods from elsewhere, and eliminates blind spots. But it takes 6 to 9 months to bear fruit and carries a significant risk of failure.
- The right approach is not to choose between the two options, but to objectively evaluate both before deciding. A structured assessment of the internal candidate, compared against an external shortlist, cuts the risk of miscasting in half.
- In approximately one-third of cases we see in briefings, the final decision is neither the one initially considered nor the executive’s first instinct.
Why This Question Always Comes Up
The typical situation, which we encounter almost monthly in briefings with executives from Belgian SMEs and mid-sized companies, looks like this. You have a senior salesperson on your team who performs well, who knows your clients perfectly, who has two or three years of occasional experience managing a junior. The Sales Director position opens up, either through creation or departure of the incumbent. The temptation is immediate: why look outside for what you have at hand, and which would cost less in fees?
The temptation is legitimate. It is also the source of a significant portion of failed sales director recruitments in SMEs.
The Peter Principle Trap
Formulated by Laurence Peter in 1969, the Peter Principle posits that in any hierarchy, each employee tends to be promoted to their level of incompetence. The mechanism is simple: you reward a good salesperson with a promotion to management. Yet selling and making others sell are two different jobs. The excellent salesperson promoted to sales director may discover they are mediocre in the new role, and the company has simultaneously just lost its best salesperson.
This mechanism has been extensively documented in management research. A study conducted by researchers Alan Benson (University of Minnesota), Danielle Li (MIT), and Kelly Shue (Yale), published in 2019 in the Quarterly Journal of Economics, analyzed the performance of salespeople in 131 companies and found that companies primarily promote their best salespeople to management, even though individual sales performance poorly predicts future managerial performance. Specifically: a salesperson who sells twice as much as their colleagues has approximately 15% additional chances of being promoted each month, but their subsequent managerial performance, measured by their subordinates’ progress, is on average significantly lower than that of managers from less stellar sales profiles.
This does not mean you should never promote internally. It means you should never promote based solely on sales performance.
What Internal Promotion Really Brings
When it works, promoting a Sales Director from the internal team brings benefits that no external recruitment can replicate in less than a year.
- Immediate product and client knowledge. The promoted salesperson already knows who the strategic accounts are, which offerings sell well, where the pricing friction points are. No ramp-up time on the business.
- Operational credibility. When the new sales director debates a complex client case with their salespeople, they have already handled this type of case. They are not theorizing; they have seen it.
- Internal growth signal. A well-executed promotion sends a clear message to the rest of the team: performance is rewarded, advancement is possible. This matters for retention of other senior salespeople looking upward.
- Reduced recruitment cost. No agency fees for the position, and faster ramp-up that reduces the opportunity cost of sales.
Still, none of these benefits trigger automatically. A poorly prepared promotion transforms an excellent individual contributor into a hesitant manager, poorly accepted, and deprived of the sales performance that was their value.
What External Recruitment Brings That Internal Cannot
In the Belgian market, where the B2B sales function remains relatively standardized by sector, an externally recruited Sales Director brings three elements that an internal profile, by construction, cannot provide.
- Critical distance on existing practices. An internally promoted salesperson has often participated in building current sales processes. They will struggle to question them, or will be perceived as contradicting themselves when they do. An external hire arrives with no debt of loyalty to existing practices.
- Proven methods from elsewhere. A Sales Director who has led a team in another sector or another company brings a repertoire of practices that have worked in another context. Not all will apply, but those that do will save two years.
- An external network. For certain functions (large account B2B, complex sales, international), the sales director’s personal network is a transferable asset. This is rarely the case for an internal promotion who has evolved exclusively within your company.
We support clients and candidates before, during, and after hiring. Not out of politeness, but by method. The first three months of a salesperson or manager determine what will happen the following three years. If integration goes poorly, the placement is lost, regardless of the quality of sourcing. That’s why our follow-up doesn’t stop at contract signing.
The Decision Framework in Four Questions
Before deciding, four questions to ask yourself, in order of priority.
1. What is the actual mission assigned to the role?
The term “Sales Director” covers very different realities. If the mission is to maintain and grow a sales system that works, an internal promotion with solid managerial support can very well succeed. If the mission is to redesign the sales strategy, rethink segmentation, restructure the team, or open new markets, you are looking for a transformation profile, and this is found almost exclusively externally.
2. Has the internal candidate already managed?
Having led a pair or trio of salespeople is not relevant. The question is: have they had to coach out an underperformer, manage a difficult departure, recruit and integrate a new salesperson, defend a budget before a committee, say no to an important client? If the answer to at least three of these five questions is no, you are taking significant risk by appointing them directly as Sales Director.
3. What is the cost-benefit ratio of the assessment?
Having the anticipated internal candidate undergo a structured assessment (in-depth interview, role-play, scientifically validated personality test) costs between €1,500 and €3,000. Compared to the cost of a bad hire at €200,000 minimum, the investment is minimal and the information provided is decisive. It is also a transparency tool for the candidate themselves, who emerges from the assessment with an honest reading of their strengths and areas of vulnerability.
4. What is the opinion of the existing sales team?
Not the direct opinion asked in a meeting, which will tell you nothing. The opinion read in confidential individual interviews that you (or a third party) conduct with each senior salesperson on the team. An internal promotion accepted but not supported by the senior team rarely lasts two years.
The Underutilized Hybrid Scenario
A third path is possible and too rarely explored: evaluate the internal candidate and an external shortlist in parallel, with the same framework, the same assessment, the same decision committee. This approach offers three benefits.
First, it protects the decision from proximity cognitive bias (we always overvalue what we know well). Second, it gives the internal candidate, if selected, total legitimacy: they will have been chosen based on rigorous comparison, not by default. Finally, it gives the company a precise reading of the market: even if the internal candidate is selected, you now have a map of what exists externally for next time.
An in-depth HR analysis of the internal candidate by a competency assessment firm provides in a few hours what a direct manager sometimes never sees: the real capacity to step up to a managerial posture, underutilized skills, blind spots to work on.
Typical Case and Typical Error
The most common case in Belgian B2B SMEs: a senior salesperson with 12 years of tenure, high performer, well-liked, whom you promote to sales director without assessment and without specific support. In the twelve months that follow, two scenarios dominate.
Scenario A (approximately 40% of cases we observe in Belgium for this profile): they succeed in transforming themselves, but not before 18 to 24 months, with external managerial support (coaching, sales management training). The company pays a ramp-up cost it had not budgeted.
Scenario B (the riskiest): they do not transform, the team senses it, two key salespeople leave within the year, the company finds itself at 24 months with a Sales Director to dismiss, a team to rebuild, and a final cost that far exceeds that of a well-executed external recruitment.
The difference between the two scenarios does not depend on the candidate’s quality. It depends on what was done before announcing the promotion: honest assessment, explicit support plan, clear communication with the team.
Conclusion: The Right Question Is Not “Internal or External”
The right question is: what objective criteria allow us to decide with the least regret possible in 24 months? The internal profile and external profile address different constraints: continuity versus transformation, knowledge versus distance, speed of assuming the role versus bringing new methods.
An executive who starts a process thinking “I prefer to promote” or “I prefer to externalize” deprives themselves of half the decision. An executive who starts thinking “I will evaluate both options with equal rigor” makes a defensible decision, whatever it may be, and one that will be understood by the team.
When the final decision concludes with recruitment of an external sales director, the work has only just begun. The next question becomes that of priority missions to assign in the first 90 days, which determines whether the recruitment will deliver on its promises or not. And of course, in both cases (internal or external), there remains structuring a package that motivates without going off track, a topic addressed in our analysis sales director recruitment budget in Belgium.
